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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <drizzled/function/locate.h>
namespace drizzled
{
void Item_func_locate::fix_length_and_dec()
{
max_length= MY_INT32_NUM_DECIMAL_DIGITS;
agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
}
int64_t Item_func_locate::val_int()
{
assert(fixed == 1);
String *a=args[0]->val_str(&value1);
String *b=args[1]->val_str(&value2);
if (!a || !b)
{
null_value=1;
return 0;
}
null_value=0;
/* must be int64_t to avoid truncation */
int64_t start= 0;
int64_t start0= 0;
my_match_t match;
if (arg_count == 3)
{
start0= start= args[2]->val_int() - 1;
if ((start < 0) || (start > static_cast<int64_t>(a->length())))
return 0;
/* start is now sufficiently valid to pass to charpos function */
start= a->charpos((int) start);
if (start + b->length() > a->length())
return 0;
}
if (!b->length()) // Found empty string at start
return start + 1;
if (!cmp_collation.collation->coll->instr(cmp_collation.collation,
a->ptr()+start,
(uint32_t) (a->length()-start),
b->ptr(), b->length(),
&match, 1))
return 0;
return (int64_t) match.mb_len + start0 + 1;
}
void Item_func_locate::print(String *str, enum_query_type query_type)
{
str->append(STRING_WITH_LEN("locate("));
args[1]->print(str, query_type);
str->append(',');
args[0]->print(str, query_type);
if (arg_count == 3)
{
str->append(',');
args[2]->print(str, query_type);
}
str->append(')');
}
} /* namespace drizzled */
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